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0. STENSON. WIRE BENDING MACHINE. APPLICATION FILED JAN. 7, 1920.

1 42 390, PatentedAug.22, 192 2.

M van fox 0/4) 5 femsofl machinery and more OLA]? STEN'SO'N, 0E CHICAGO, ILLINOIS, ASSIGNOR T0 WESTERN ELECTRIC COMPANY,

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Specification of Letters Patent.

Patented Aug. 22, 13922.

Application filed January 7, 1920. Serial No. 349,967.

To all whom it may concern:

Be it known that I, OLAF SrnNsoN, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Wire-Bending Machines, of which the following is a full, clear, concise, and exact description.

This invention relates to special tools and particularly to wire bending apparatus and it has for its object to provide a simple, convenient and efficient machine for bending to the required form a plurality of supporting wires extending from a carrying member of insulating material used in vacuum tubes or electric light bulbs. To these and other ends the invention resides in certain improvements and combinations of parts which will be hereinafter more fullydescribed, the novel features being pointed out in end of the specification.

In the drawings: s

Figure 1 is a top view of a bending machine constructed in accordance with and illustrating one embodiment of my invention- Figure 2 is a section taken substantially on the line 22 of Figure 1; s

Figure 3 is a detail fragmentary perspective view of the seat in which the workpiece is held;

Figure 4 is a top view partly in horizontal section shown the parts in a position different from that shown in Figure 1, the operating handle being partly broken away;

' Figure 5 is a fragmentary detail section taken in the same plane as Figure 2 but showing the rotary die at the conclusion of its operation; and V Figure 6 is a perspective view, partly broken away, of the vacuum tube in the manufacture of which theapparatus is used.

Similar reference numerals throughout the several views indicate the same parts.

Referring first to Figure 6 A indicates a rectangular block of insulating material, usually made of the commercial substance Lav ite, which is held by clips B near the head of the tube C. Proceeding laterally therefrom and carried thereby are two wires D that support the grid E while from the under side projects a relatively transverse wire F that is formed into a hook to support a filament G. The function of the present machine is the claims at the.

to form this hook F and to also give the proper angular form to the wires D.

Referr1ng to the otherfigures, two associated blocks 1 and ,2 form the bases for a fixed die 3 and a movable die 4. The fixed die has a raised center provided with a rectangular seat 5 best shown in Figure 3 and of dlmensions to snugly accommodate the block A. In the present instance, the said block is supported therein by its lateral wires D extending through lateral slots or openings 6 1n the seat, while the bottom wire F extends through a slotted opening 7 in the bottom of the seat. From the region of the seat, the die faces of the die member 3 extend rearwardly and laterally as shown. The movable die 4 is of complementary form and is provided with a central recess 8 to receive the seat 5 and the workpiece as the two elements come together. It is carried on a ram 9 operating in a T-slot uide 10, in the block 2 and its rear end is bifurcated, as shown in Figure 2, to receive an operating lever 11 slotted at 12to take a pin 14 on the ram, the operating lever being pivoted to the block at 15. Projecting from the recess 8 of the die element 4 is a yielding plunger 16 slidable in a bore 17 in the ram from which it is normally projected by a coil spring 18. It is further guided and prevented from turn ing by a transverse pin19 extending through a slotted portion 20 of the plunger. As the dies come together or just prior to the contact of the movable die 4 with. the wires D of the workpiece, this plunger 16 cooperates with the block A and clamps it in place with a yielding pressure. The normal position of the parts just after the workpiece has been inserted is shown in Figure 1 and the completion of the forming operation is illustrated in Figure at.

The above'described clamping action of the die a and its attachments is utilized to hold the workpiece while the wire F is be- ,,,of"its handle 25, the rotary die .24 is then,

moved from the position of Figure 2 to die member swings, which face is spaced from; the axis' a distanceequal to the thick-. ness of the wire F.

A longitudinal recess or groove 27 runs through the extension 21 and the shaft 23 to accommodate a sliding mandrel 28 of the formshown in Figures 2 and ,4. This mandrel lies with one edge COIHOlClGIlt Wlth the turning axis of the die and it 1s formed, in

the present instance, by an extension on a plunger 29' arranged in, alignment withthe shaft 23 and movable endwise by means of ga knob 30 within the limits prescribed by a pin 31 engaging in a cutaway portion 32 thereof. With the movements of the plunger between thedo'tted and full line positions of Figure 1, the mandrel 28 is operated into and out of a position in which it intersects the slot 26 and crosses above the wire F.

In operation, the ram 9 is held in the position of Figure 4: to clamp the workpiece in its seat and the mandrel 28 is pushed into the operative position of Figure 4:. By means that'of Figure 5. The face of the die-thus swings around the axis, and the end of the wire I? which initially lald straight along the face of'the' die, 'isbent around the manfdrel 28 into the hooked shape shown in Fig. ure 5. The die 24: is returned to its normal position against a stop pinBS and the mandrel 28 withdrawn longitudinally by means of thejknob;30, While the ram 9 is also withdrawn to the position of Figure 1. torelease,

the block A. The latter maynow be removed in the manner-in which it was inserted as the. hooked end. of wire F is free topasS through the; slot 26 inthe die and 40 through the opening 5 of the'die3.

"Iclaim as my invention:

j. 1., Ina wire bendin'gmachina'a die mem ber comprising a base, horizontally slotted vertical members projecting therefrom said members and slots being arrangedto provide'a sea-t fora workpiece having wires exprovided in ,the seat tending therefrom, a ram mounted for horizontal reciprocation toward and away from said die member and carrying a second die member adapted tonform the wires of said workpiece around therear walls of said slots and against said vertical members.

27 In a wire-bending machine, the combination with. a die member provided with a seat for the workpiece having horizontal. slots to accommodate wires extending therefrom, of a ram mounted for horizontal reciprocation toward and from the seat and carrying a die member adapted to form the wires against the first mentioned diemember and. a yielding clamping member on the ram adapted to engage and hold the workpiece as the'dies go into effect.

8. In a wire bending machine a die member comprising a base, horizontally slotted vertical'me'mbers projecting therefrom, said.

ing horizontal slots to accommodate wires extending therefrom, of aram mounted for horizontal reciprocation toward and from the seat and carryinga die memberadapted to form the wires against the first mentioned diemember, said die member on the ram being recessed to receive theraised portion of the other and a yielding clamping memberv on the ram normally projecting, from the recess to engage and hold the workpiece as the dies go intoefi'ect.v

5. In a wire bending machine, the combi nation with ashafthaving a rotary bending die mounted thereon, said shaft and, die having alined transverse slots therein extending through their axis, of tractable mandrel intersecting the slot.

6. In a wire bending machine, the combination with a rotary;- bending itsaxis, of alongitudinally movable man drel intersecting the slot and having one.

edge coincident with the axis of said die.v In a w re bending mach ne, the combination with a shaft" having a longitudinal recess therein and a longitudinally movable mandrel inthe recess havingone edge coincident with the axis of the shaft, of a ro tary bending die mounted on the shaft.

8. In a wire bendingmachine, the combination withia shaft having a longitudinal recess therein and a rotary bending die mounted "on the shaft, said diev and. shaft being provided with aligned transverse, slots,

of a longitudinally movable mandrel oper ating in the recess of the shaft to extend parallel with theaxis of thelatter.

9. In a wire bending machine, the combination with a die member provided with a seat for the workpiece having lateral open; ingstherein to accommodate wlres extend opening in its bottom to accommodate a third ,wir'e extending transversely to the others, \of' a ram movable toward and fronr the seat andcarryinga die member adapted. to form the lateral 'wires against the first mentioned die member,-a mandrel adapted to support said third wire and a rotary die' a longitudinally re die having a; transverse slot therein extending through.

mg laterally from the workpiece, I and an for bending the latter around the mandrel.

10. A wire working machine adapted to operate upon a workpiece having a plurality of wires projecting therefrom, said machine comprising a holder for said workpiece, a reciprocating member for forming one of said wires around said holder, a mandrel carried by said holder, and a rotary member for forming another of said wires around said mandrel.

11. In a wire bending machine, a die member comprising a base, vertical members projecting therefrom, one of said members being horizontally slotted, said members and slot being arranged to provide a seat for a workpiece having a wire extending therefrom, a ram mounted for horizontal reciprocation toward and away from said die member and carrying a second die member adapted to form the wire 01": said workpiece.

In witness whereof, I hereunto subscribe my name this 30 day of December A. D.,

OLAF STENSON. 

